Cells that generate electrical impulses form ________ tissue
Fill in the blank(s) with correct word
nerve (or nervous)
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What is a main function of the structure in the accompanying figure labeled "B"?
a. It controls cell shape. b. It separates DNA during cell division. c. It helps nerve cells lengthen. d. It is found in hair. e. It helps regulate DNA replication.
How did researchers test if flatworms could moderate the immune system?
A. exposing white blood cells to flatworm antigens and measuring interleukin-10 concentrations B. exposing white blood cells to dust mite antigens and measuring interleukin-10 concentrations C. exposing white blood cells to flatworm antigens and measuring histamine concentrations D. exposing white blood cells to dust mite antigens and measuring histamine concentrations E. infecting children with flatworms and looking at their number of white blood cells
Biodiversity hotspots are defined by which two criteria?
a) species richness and size b) number of endemic species and degree of threat c) ecological diversity and species diversity d) size of distance from nearest alternative hotspot e) species richness and ecosystem integrity
In addition to maintaining a wet environment necessary for survival of the embryo, what other essential characteristic does the amniotic egg possess?
A) low energy/material for the mother to produce B) a shell that most predators cannot break C) ability to allow for gas exchange D) easier fertilization E) ability to absorb nutrients from the environment